The study of quantum field theory on a curved space-time (QFTCS) deals with the interplay of quantum field theory (QFT) together with classical general relativity (GR) (see [1]}[2]} and the recent review [3]}). In the past few decades interest in QFTCS has been driven by a variety of developments. Foremost among these was the recognition by Bekenstein [4]}, Hawking [5]}[6]}[7]}, Unruh [8]}, and others [9]}[10]} in the 1970's that the intersection of gravitation and quantum theory yields novel features of which information and entropy are inseparable ingredients.
